Compression gauge



Jan. 5 ,1926.

P. L. ORMISTON- coMPEssIoN GAUGE Filed August 7, 1924 gnw'ntz Per@ El@ff/Staff Patented Jan. 5, 1926.

PATENT vorruer.

PERLEY L. ORMISTON, F PORTLAND, OREGON.

vCOMPREssion GAUGE.

Application led August 7, 1924. Serial No. 730,697.

To all whom t may concern.'

sothat it rmay beread at leisure. 30

pyention is to providea'device. of this nature and.. claimed.

Be it known that I, PERLEY L. ORMIS- TON, a citizen of the UnitedStates, residing at Portland, in the county of Multnomah and State ofOregon, have'invented cert-ain new and useful Improvements inCompression Gauges, of which the following is a specification.

The present invention relates to an improvement'in'compression tgaugesof that type designed particularly for use in explosive enginessuch asthose of the internal combustion type, and adapted in such use toindicate the maximum pressure of compression of the cylinder' with whichthe gauge is used.` i

The improved gauge is designed'to-visually indicate the maximumcompression of the particular cylinder, and to this end is adapted toreceive the gases from the cylinder under thecompression stroke and to.indicate the amount of such pressure.

An important object of the invention is to provide a gauge of thisnature which will accurately indicate the compression obtained in anVengine cylinder and in which the indicating stem vis held in anyposition to which it'has been moved by the pressure "Another veryimportant object ofthe in? which is positive in action, and rwhich isnot liable tofget out of order easily.

l `Another'important object Vof the invention is to provide agaugeof'this nature which may be utilized to advantage in motors providedwith overhead valve mechanism,l the device being constructed so. that 1twill not be interfered nwith by said overhead valve structure. v a

A1 still further veryV important object of the invention is to generallyimprove upon compression gauges of this type byprovidingv a vdevicerpossessing a very simple and efficient construction, one which isreliable in operation, inexpensive to manufacture, durable, strong, easyto manipulate, and otherwise well adapted to the purpose for which itis'designed. y `'With the above'and numerous other vobjects in view'aswill appear as the description progresses, the invention resides incertain novel features of construction, and in the combination andarrangement of parts as will be hereinafter more fully described In thedrawing sion gauge embodying the features invention,

Figure 2 is a longitudinal section taken therethrough,

Figure 3 is a detail perspective of the plate at the outer or upper endof the gauge,

Figure 4: is a detail fragmentary view of the pliable bar for indicatingthe pressure,

Figure 5 is an elevation thereof, and

Figure 6 is a detail perspective of the indicating bar guide conduit.

Referring to the drawing in detail wherein like reference numerals referto similar parts throughout the several views it will be seen that thebase B is in the form of a nipple having a bore 5. The base B isinternally threaded at its upper end and then reduced so as to form anannular shoulder 6. External threads 7 are provided at the bottom end ofthis base. A cross piece 8 rests on the annular shoulder 6 and acts as astop as will be clear as the description proceeds. A cylinder 9 providedwith an tion having a rectangular shaped bore thercin. Shoulders 13 areprovided'on the ef terior surfaces of the conduit adjacent its lower endand an inner plate washer 14 receives the conduit with these shouldersin abutment therewith as is clearly illustrated in Figure 2 when thevdevice4 is assembled. The outer plate washer 15 is .provided with arectangular shaped opening 16 formed by the lip 17 which is strucktherefrom and then bent upwardly. The conduit passes through the opening16 and the lip 17 is held inengagement therewith by means of a screw 18.An orifice 19 is provided in the conduit above theouter plate washer 15.The plate washer 15 may be rotated for turning the conduit by means of aradially extending handle which terminatesin a gripping 4portion 21 bybeing twisted, said'gripping portion extending slightly over the side ofthe cylinder 9. An indicating lug 22 extends inwardly from one edge ofthe orifice 19 and cooperates with the indicia pinvided on the pliablebar 23 which is slidable through the curved guide conduit l2. .i piston2l is slid-able in the cylinder 9 and the body thereof is provided withthe shirt 25. A gasket or washer QG is held on to the bzttom face of thebody of the piston fl- 1L by means of a screw 2T which also en- `gef.the bottom of a conical shaped cup disposed within the contines of theskirt A helical spring 29 is positioned within the cylinder 9 and itsends are in contact with the closure 1l and the body of the piston Q-'lthereby normally holding this piston at the bottom of the cylinder 9 adjacont the base nipple B so that the screw 2T is in abutment with thestop piece S. This preventi` the washer 26 which is preferably of theflexible type made out of leather or rubber or any otherI suitablematerial from coming into contact with the shoulder of the base nipple lthereby preventing premature destruction thereotl which would otheiwvisebe caused by the spring 29 forcing they piston to the bottom of thecylinder when the pressure released.

'Ehe body portion of the base nipple is preferably in the form of ahexagonal nut whereby the external threaded portion T thereof may beeasily threaded into the spark plug opening of a cylinder. Then thedevice is thus assembled with a cylinder and the engine is turned overthe compression of the cylinder will be registered by this device as thepiston will be raised compressing the spring 29 and forcing the pliableindicating bar 23 through the curved guide conduit and the pressure willbe indicated by that portion of the indicia on the bar which is inregistry with the indicating lug in the orifice 19 of the guide conduitu., YWhen the compression in the cylinder is relirned by the opening ofthe exhaust vat-.c the springl 29 will force the piston bacl: to initialposition with the screw 2T in abutment with the stop piece 8. However`the pliable bar will remain in its position to which it has been forcedupon the upward movement of said piston thus indicating the maximum ofthe compression. This bar 23 is thus retained in its position because ofits pliable nature and the curvature of the guide conduit. l.Then it isdesired to again use the gauge the pliable bar is forced downwardly intothe c vlindcr and the cup 8 acts as, a guide fo as to properly centerthc inner terminal of the bar on the piston. A er the device has beenscrewed into the heL d of the cylinder block provided with overlicad valve mech-ani. nr the outer plate washer l5 may be `rotated so as torotate the guide rondrit in order that it may curve outwardly to aneside. of the bloclt oL in any othe.l

position so that when the pliable 'bar 23 is forced to an extendedposition it will not engage any of the overhead valve mechanisms.

It is thought that the construction, operation, and advantages of theinvenion will now be clearly understood without a more detaileddescription thereof. lVhilc the preferred embodiment of my invention hasbeen described in detail, it will be understood that I do not wish to belimited to the particular construction set forth, since various changesin the form, material, proportions, and arrangement of parts, and in thedetails of construction may be resorted to without departing from thespirit or scope of the invention or destroying any of the advantagescontained therein, heretofore described and delined in subjoined claims.

Having thus described my invention, what claim as new is:

l. pressure gauge of the class described including a cylinder having apressure inlet at onel end, a piston slidable in the cylinder, yieldablemeans for normally pressing tho piston toward said one end of thecylinder, a resilient flexible bar movable through one end of thecylinder and having one end engaging said piston, a guide carried by thecylinder and cooperating with the bar for flexing the same so that thebar will be frictionally retained in any position to which it is movedby the piston.

A compression gauge of the class described including a cylinder having apressure inlet at one end, a piston slidable in the cylinder, a springyieldingly pressing the piston toward said one end of the cylinder, aresilient flexible indicating bar slidable into and out of the cylinderand having one end engageable with the piston to be actuated thereby, acurved guide carried by the cylinder, said bar being slidable throughsaid guide in order that it will be flexed for being retained in anyposition to which it is moved by the piston.

3. ln a compression gauge of the class described, a cylinder having apressure inlet at one end, a piston movable in the cylinder, a spring toyieldingly press the piston toward said one end of the cylinder, acurved guide in the other end of the cylinder, and a. pliable indicatingbar slidable through the guide and having one end engaging the piston soas to be movable by the latter.

el. In a compression gauge of the class described, a cylinder having apressure inlet at one end, a piston movable in the cylinder, a spring toyieldingly press the piston Vtoward said one ond of the cylinder, acurved guide in the other end of the cylinder, a pliable indicating barslidable through the curved guide and having one end engaging thepiston, said guide being provided with an orifice at one side thereof,and said pliable bar being provided with indicating indicia which may beread through the orifice of the guide.

5. In a compression gauge of the class described, a cylinder having apressure inlet at one end, a piston movable in the cylinder, means foryieldingly pressing the piston normally toward said one end of thecylinder, a curved guide carried by the other end of the cylinder, anindicating bar having one end engaged with the piston so as to be movedout of the cylinder thereby for indicating the pressure in the cylinderof an engine, and means for rotating the guide and the'indicating bar.

6. In a compression gauge of the class dcscribed, a cylinder having apressure inlet at one end, a piston movable in the cylinder, a springassociated with the piston to press it normally toward said one end ofthe cylinder, a guide rotatably mounted in one end of the cylinder andprojecting outwardly of the latter, means for rotating the guide, and

an indicating bar slidable through the guide and having one end engagedwith the piston.

7. In a compression gauge of the class described, a cylinder, a pistonslidable in the cylinder, a spring associated with the piston and thecylinder to press the former toward one end of the latter, a pliableindicating bar movable into and out of the cylinder and having one endengaging the piston so as to be moved by the latter, and means carriedby the cylinder for curving and rotating the pliable bar.

8. In a compression gauge of the class described, a cylinder having apressure inlet at one end, a piston slidable in the cylinder, a springcooperating With the piston to normally press it toward one end of thecylin der, said cylinder being provided with a partially closed end, acurved guide conduit passing through the partially closed end of thecylinder, a Washer plate in the cylinder and carried by the guideconduit, a second Washer plate on the outside of the partially closedend of the cylinder and fixed to the guide conduit, and a pliableindicating bar slidable in the guide conduit .1nd having one endengaging the piston.

9. In a compression gauge of the class described, a cylinder having apressure inlet at one end, a piston slidable in the cylinder, a springcooperating with thepiston to normally press it toward one end of thecylinder, said cylinder being provided with a partially closed end, acurved guide conduit passing through the partially closed end of thecylinder, a Washer plate in the cylinder and carried by the guideconduit, a second Washer plate on the outside of the partially closedend of the cylinder and fixed to the guide conduit, and a pliableindicating bar slidable in the guide conduit and having one end engagingthe piston, and an arm carried by the second named Washer plate forfacilitating rotation of the guide conduit.

In testimony whereof I aiiix my signature.

PERLEY L. ORMISTON.

